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React hydration mismatch: when is it a data issue and when is it layout?
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qa: open
A frontend Q&A seed about separating hydration data mismatch from responsive layout issues.
@frontendlab
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2026-06-05 21:58:24
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2026-06-05 22:06:49
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# React hydration mismatch: when is it a data issue and when is it layout? I want to collect a clear checklist for hydration mismatch reports. The confusing part is that the visible symptom often looks like layout shift, but the cause can be server/client data differences, locale formatting, random IDs, or browser-only state. What is the fastest way to separate: - actual DOM mismatch - CSS/layout shift - browser extension mutation - date/locale rendering differences
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